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  1. AD790
    Production
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    High Speed Comparators (
    Fast, Precision Comparator
    AD790

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    Sample & Buy

  2. AD790: Fast, Precision Comparator Data Sheet
    Data Sheet

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    1. AD790JNZ External hystersis

      Forum Thread
      Answered
      Other Products (EN)
      28 August, 2014
      Hello everyone, I am creating a comparator circuit which will take a triangle wave and turn it into a square wave. Now, for my Vref, I do not have a fix input. I have it adjustable in the sense that it is a DAC (Schematic is attached). This will allow …

    2. RE: AD790JNZ External hystersis

      Forum Reply
      Other Products (EN)
      02 August, 2018
      This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.Thank you,EZ Admin

    3. RE: AD790JNZ External hystersis

      Forum Reply
      Other Products (EN)
      01 September, 2014
      Yes, that is true but, the DAC is used to control the duty cycle of the output waveform. The hysteresis is used to prevent any jittering in the input waveform from causing any unwanted misfires. (See pic). At any rate, I breadboarded the circuit and to my surprise, there is …

    4. RE: AD790JNZ External hystersis

      Forum Reply
      Other Products (EN)
      31 August, 2014
      Hi, philm! Comparator will be drived by output voltage of DAC directly. Very simply. No R1,R2 needed. At DAC you dated valid code for needed Vcontrol from DAC. Regards!

    5. RE: AD790JNZ External hystersis

      Forum Reply
      Other Products (EN)
      28 August, 2014
      I am not sure what you mean by your post. Can you explain a little bit more by what you mean?

    6. RE: AD790JNZ External hystersis

      Forum Reply
      Other Products (EN)
      28 August, 2014
      It will be from 250 mV to 5 V. Yes, this is fine that the AD790 does not go to fulll 5 V, in my application, that may be a bad thing if the duty cycle was 100%! I think that you forgot to type something. How much higher is …

    7. RE: AD790JNZ External hystersis

      Forum Reply
      Other Products (EN)
      28 August, 2014
      Hello, your considerations are correct. The feedback resistor R1 in hysteresis.jpg is times higher than R2. For you hysteresis you can replace one of these resistors by a series connection of a fixed resistor and a potentiometer. The AD790 is not rail-to-rail, so maybe input values in …

    8. RE: AD790JNZ External hystersis

      Forum Reply
      Other Products (EN)
      28 August, 2014
      Hi, philm! So no hysteresis control is it, only level control. There will be next circuit: Regards!

    9. How tot decrease the output noise of an opamp?

      Forum Thread
      Answered
      Other Products (EN)
      27 September, 2017
      For example, I use an AD795JN to build an x10 inverter amplifier( R1= 10k, RF = 100k). I connect the input to the ground and measure the RMS value of output. I got several mV. But the theoretical value is about several uV. So how to decrease the RMS value of …

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